About Us

We are a dedicated team of sales and use tax professionals who have committed our careers to helping businesses and fellow professionals with sales and use tax problems. Since the only work we are focused on is sales tax consulting, businesses never have to be concerned that we will try to sell them other services they do not need. And professionals never have to be concerned with us encroaching on their client relationships, because we view you, our fellow professional, as our client.

Mark L. Stone, CPA, MST
Managing Partner, Tax Professor
Mark has dedicated his career to providing sales and use tax consulting services. He began his career as an auditor for the New York State Department of Taxation & Finance. After several years with the Tax Department, he left to work at and eventually run the sales and use tax departments of two of New York's largest firms. Immediately prior to founding Sales Tax Defense LLC, Mark was the partner-in-charge of the Long Island office of a national State and Local tax consulting firm.

Mark has devoted almost two decades of his career to helping people with sales and use tax problems. In 2006 Mark created Sales Tax Defense to help advise clients on the sales and use tax rules, provide sales and use tax planning, and to handle sales and use tax audits

Mark holds a Certified Public (CPA) license from the State of New York. He earned a Masters Degree of Taxation from Long Island University - CW Post Campus, graduating with honors. Mark was invited to return and currently is an Adjunct Professor teaching both Graduate and Undergraduate tax classes at CW Post. In addition, Mark is a frequent sales tax speaker for The New York State Society of CPAs and The Nassau Bar Association.

Mark is active in his community, and is committed to giving his time to local organizations educating businesses on the current sales and use tax laws and regulations. He accomplishes this by speaking at Chambers of Commerce throughout Long Island as well as Small Business Incubators. As an adjunct professor, Mark encourages his students to start getting involved in professional organizations such as the Institute of Management Accountants (IMA,) where he is on the Board of Directors. Mark is a staunch supporter of the March of Dimes Foundation. He understands the important work this organization does for pregnancy and baby health, especially since his son was born prematurely. His son is now doing well, and was recently joined by a little baby sister. Mark and his wife live with their family on Long Island, New York. http://www.marchofdimes.com

Note: Nothing on this website should be interpreted to be legal, tax, or accounting advice. Every business or person should obtain detailed advice as applied to a specific transaction or hypothetical fact pattern.